Ever hear about the many water-powered vehicles? Or, what about the General Motors EV1, the world's first mass produced electric car that made its debut in 1996? Those are just two of the strange technologies that are alleged to have been suppressed by powerful person(s), companies, government, etc. Continue reading to see more.

5. General Motors EV1

The EV1 was the world's first mass-produced electric car, with 800 of them up for lease from GM in the late '90s. GM ended the EV1 line in 1999, stating that consumers weren't happy with the limited driving range of the car's batteries, making it unprofitable to continue production.

Many skeptics, however, believe GM killed the EV1 under pressure from oil companies, who stand to lose the most if high-efficiency vehicles conquer the market. It didn't help that GM hunted down and destroyed every last EV1, ensuring the technology would die out.

4. Chronovisor

What if you had a device that could see into the future and revisit the past? And what if you didn't need Christopher Lloyd to help you? Father Pellegrino Maria Ernetti, an Italian priest, claimed in the 1960s to have invented what he called a Chronovisor, something that allowed him to witness Christ's crucifixion.

The device supposedly enabled viewers to watch any event in human history by tuning in to remnant vibrations that are caused by every action. (His team of researchers and builders included Enrico Fermi, who also worked on the first atomic bomb).

3. Magnetic / Anti-Gravity Technology

Coral Castle is a stone structure created by the Latvian American eccentric Edward Leedskalnin (1887-1951) north of the city of Homestead, Florida in Miami-Dade County at the intersection of South Dixie Highway (U.S. 1) and SW 157th Avenue. The structure comprises numerous megalithic stones (mostly limestone formed from coral), each weighing several tons.

It currently serves as a privately-operated tourist attraction. Coral Castle is noted for legends surrounding its creation that claim it was built single-handedly by Leedskalnin using magnetism and/or supernatural abilities. The stones are fastened together without mortar. They are set on top of each other using their weight to keep them together. The craftsmanship detail is so skillful and the stones are connected with such precision that no light passes through the joints.

2. Water-Powered Cars

At least as far back as 1980, Stanley Meyer claimed that he had built a dune buggy which ran on water instead of petrol. The "fuel cell", which he claimed was subjected to an electrical resonance, would split the water mist into hydrogen and oxygen gas, which would then be combusted back into water vapour in a conventional internal combustion engine to produce net energy.

Insiders have loudly claimed that Meyer was poisoned after he refused to sell his patents or end his research. Fearing a conspiracy, his partners have all but gone underground (or should we say underwater?) and taken his famed water-powered dune buggy with them. We just hope someone finally brings back the amphibious car.

1. Free Energy

Nikola Tesla was more than just the inspiration for a hair metal band, he was also an undisputed genius. In 1899, he figured out a way to bypass fossil-fuel-burning power plants and power lines, proving that "free energy" could be harnessed using ionization in the upper atmosphere to produce electrical vibrations.

J.P. Morgan, who had been funding Tesla's research, had a bit of buyer's remorse when he realized that free energy for all wasn't as profitable as, say, actually charging people for every watt of energy use. Morgan then drove another nail in free energy's coffin by chasing away other investors, ensuring Tesla's dream would die.